Pvbd, Pvbz With Optional Diverter Feature; Principle Description Of Pvbd Diverter - Danfoss PVG 32 Technical Information

Technical Information

PVBD, PVBZ with optional diverter feature

Principle description of PVBD diverter:

10
PVG 32 AG Modules
The utilization of a PVBZ module can be further enhanced by adding a diverter valve. Mounted on top of
the PVBZ valve slice, a 6/2 PVBD diverter valve can direct valve flow to either of two set of ports (A1/B1 or
A2/B2). The PVBD diverter spool (shift spool) is actuated by the PVC solenoid valve by means of pilot
pressure.
Features:
•
Enlarge the application range (2 functions)
•
To be mounted on top of PVB or PVBZ modules
•
Pilot operated with PVC
•
Auxiliary valve on tractors for function control on implements: cylinder positioning when the demand
on neutral port leakage is limited.
PVBD, PVBZ with optional diverter feature
PVC
A1
Pilot supply
PO Check valve
Pilot Valve
PVM Manual
Actuator
•
PVC off: The shift spool is held in position (flow to A1/B1) by the spring in the right hand side
(opposite the PVC). The spring chamber is always connected to the T0 gallery in the PVBZ body.
•
PVC on: Pilot pressure is led into the chamber next to the PVC. A limited flow is passing through the
shift spool and the two orifices and into the spring chamber connected to T0. Pressure-drop across
the orifices creates the shift force moving the shift spool towards the spring. As a result, port A2/B2
becomes active.
Leakage (along the spool clearance) from pressurized work ports A1/B1 or A2/B2 will always be drained
to T0 either directly in the spring chamber or through the shift spool. This secures safe positioning of the
shift spool as leakage never will build up pressure up in the control chambers.
Safety recommendation: Shift of the diverter should only be possible when the main spool is in neutral.
This has to be ensured through a proper set-up in the controller/MMI hardware.
11051935 • Rev AE • Feb 2014
PVBD (Diverter)
A2 B1 B2
B
A
Pressure compensator with bleed off
Analogue or
Digital CAN
ISOBUS
T0
PVE
Actuator
P301 096
Inductive LVDT Sensor